Weathering Steel Sheet
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Weathering Steel
Corten Steel Sheet
Product Introduction
| Weathering Steel Plate Technical Specifications | |
| Specification | Details |
| Common Grades & Standards | ASTM A242 / A588 Grade A, B, C, K: Standard weathering steel grades with varying strength levels and compositions for structural use. ASTM A606 Type 4 / A871-65: High-strength, low-alloy (HSLA) hot/cold-rolled sheet and plate with improved atmospheric corrosion resistance. EN 10025-5 (S355J0W/J2W, S355K0W/K2W): European grades; J0/J2 for impact at 0°C, K0/K2 for impact at -20°C. Corten A / Corten B: Popular trade names for weathering steel, often corresponding to ASTM A242 and A588 respectively. JIS G3125 SPA-H / G3114 SMA: Japanese standards for welded structures and bridges. |
| Key Alloying Elements & Mechanism | Copper (Cu): 0.25-0.55% - Primary element for forming protective patina. Chromium (Cr): 0.30-1.25% - Enhances corrosion resistance and patina adhesion. Nickel (Ni): 0.02-0.65% - Improves toughness and corrosion resistance. Phosphorus (P): ≤0.04% - Accelerates patina formation. Mechanism: Forms a dense, adherent rust layer (patina) that inhibits further corrosion when exposed to wet/dry cycles. |
| Thickness Range | Sheet: ≤ 4.76 mm (0.1875 in) Plate: > 4.76 mm (0.1875 in) up to 150 mm (6 in) Standard Stock Range: 6 mm (0.236 in) to 100 mm (4 in) |
| Standard Size Range | Width: 1000 mm (39 in) to 3000 mm (118 in) Length: 2000 mm (79 in) to 12000 mm (472 in) Standard Plate Sizes: 1524 mm x 3048 mm (60 in x 120 in), 2000 mm x 6000 mm (79 in x 236 in) |
| Mechanical Properties (ASTM A588 Grade A Typical) | Yield Strength (min): 345 MPa (50 ksi) for thickness ≤ 100 mm. Tensile Strength: 485 MPa (70 ksi) min. Elongation (min): 18% in 200 mm, 21% in 50 mm gauge length. Impact Toughness (Charpy V-notch): 20 J (15 ft-lb) min at -18°C (0°F). |
| Corrosion Resistance Performance | Atmospheric Corrosion Rate: Typically 4-6 times slower than carbon steel (A36) in rural/urban atmospheres. Patina Formation: Starts within 6-18 months; final stable color (rusty brown to dark purple) develops in 3-5 years. Unpainted Service Life: Can be used bare in most outdoor atmospheres without significant loss of cross-section. Not Recommended For: Continuous immersion, severe marine splash zones, or highly polluted industrial atmospheres without protection. |
| Available Conditions & Processing | As-Rolled (Hot Rolled): With initial mill scale. Pickled & Oiled: Scale removed for immediate patina initiation or painting. Pre-Weathered/Patinated: Artificially aged to achieve instant uniform patina appearance. Shot Blasted: Clean surface for immediate painting or accelerated natural weathering. |
| Fabrication Properties | Weldability: Good, similar to HSLA steels. Requires compatible weathering electrodes (e.g., AWS E7018-W1). Machinability: Fair to Good (approximately 70% of A36 steel). Formability: Similar to equivalent strength carbon steel. Cutting: Flame, plasma, laser, and waterjet cutting are all suitable. |
| Design & Application Considerations | Drainage: Must be designed to avoid water/sediment trapping. Contact with Non-Weathering Materials: Prevent electrolytic corrosion by isolating from dissimilar metals. Staining: Initial runoff may stain adjacent materials; requires proper detailing. Maintenance: Essentially maintenance-free when used bare; occasional inspection recommended. |
| Primary Applications | Architecture & Sculpture: Building facades, roofing, ornamental sculptures (notable use: The Angel of the North). Bridges & Infrastructure: Exposed structural elements, bridge girders, guardrails, light poles. Transportation: Railcar bodies, shipping containers, truck trailers. Utilities & Industrial: Transmission towers, utility structures, exhaust stacks, outdoor storage tanks. |
| Grade / Standard | Common Name | Thickness (mm) | Width (mm) | Length (mm) | Yield Strength (MPa, min) | Condition / Surface | Key Alloying Elements |
| ASTM A588 Gr. A / K | Corten A (Weathering Steel) | 3, 4.5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50 | 1500, 1800, 2000, 2500, 3000 | 6000, 9000, 12000, Custom | 345 (50 ksi) | Hot Rolled (HR), Mill Scale, Pre-weathered | Cu, Cr, Ni, P |
| ASTM A606 Type 4 | HSLA Weathering Steel | 1.5, 2.0, 2.5, 3.0, 4.0, 5.0 | 900, 1219, 1524, 1829 | 1829, 2438, 3048, 6000 | 345 | Hot Rolled, Pickled & Oiled, or Coiled | Cu, Cr, Ni, Si |
| ASTM A871-65 | Higher Strength Weathering | 5, 6, 8, 10, 12, 16, 20, 25 | 1500, 1800, 2000, 2500 | 6000, 9000, 12000 | 448 (65 ksi) | Hot Rolled (HR) | Enhanced Cu, Cr, Ni, Mo |
| EN 10025-5 S355J0W / J2W | European Weathering Steel | 3, 5, 8, 10, 12, 15, 20, 25, 30, 40 | 1500, 2000, 2500, 3000 | 6000, 9000, 12000 | 355 | Hot Rolled (HR), As Rolled | Cu, Cr, Ni |
| EN 10025-5 S355K2W | European Impact-Tested Weathering | 6, 8, 10, 12, 16, 20, 25, 30 | 1500, 2000, 2500 | 6000, 9000, 12000 | 355 | Hot Rolled, Normalized | Cu, Cr, Ni, V |
| JIS G3125 SPA-H | Japanese Weathering Steel | 1.6, 2.3, 3.2, 4.5, 6.0, 9.0, 12.0 | 900, 1219, 1500, 1800 | 1829, 2438, 3048, 6000 | 355 | Hot Rolled (HR) | Cu, Cr, Ni, P, (Ti) |
| JIS G3114 SMA490AW | Weathering Steel for Welding | 6, 9, 12, 16, 19, 22, 25, 32 | 1500, 1800, 2000, 2500 | 6000, 9000, 12000 | 365 | Hot Rolled (HR) | Cu, Cr, Ni, V, (Nb) |
| Cor-Ten B (Proprietary) | Corten B (Higher P Content) | 3, 4.5, 6, 8, 10, 12, 16, 20, 25, 30 | 1500, 1800, 2000, 2500 | 6000, 9000, 12000 | 345 | Hot Rolled, Mill Scale | Higher P than Corten A |
| ASTM A242 / A606 Type 2 | Early Weathering Steel Type | 4.5, 6, 8, 10, 12, 16, 20, 25 | 1500, 1800, 2000 | 6000, 9000, 12000 | 290 (A242), 345 (A606) | Hot Rolled (HR) | Cu, Cr, Ni, (Mo) |
| Custom Painted / Pre-Patina | Architectural Finish | 3, 4, 5, 6, 8, 10 | 1000, 1219, 1500, 2000 | 2000, 2440, 3000, Custom | As per base steel | Hot Rolled, Pre-Weathered or Artificially Patinated | N/A (Surface Treatment) |
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